162 lines
4.2 KiB
C
162 lines
4.2 KiB
C
/*
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*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*
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*/
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#ifndef _VMBUSPACKETFORMAT_H_
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#define _VMBUSPACKETFORMAT_H_
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struct vmpacket_descriptor {
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u16 type;
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u16 offset8;
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u16 len8;
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u16 flags;
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u64 trans_id;
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} __packed;
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struct vmpacket_header {
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u32 prev_pkt_start_offset;
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struct vmpacket_descriptor descriptor;
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} __packed;
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struct vmtransfer_page_range {
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u32 byte_count;
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u32 byte_offset;
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} __packed;
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struct vmtransfer_page_packet_header {
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struct vmpacket_descriptor d;
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u16 xfer_pageset_id;
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bool sender_owns_set;
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u8 reserved;
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u32 range_cnt;
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struct vmtransfer_page_range ranges[1];
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} __packed;
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struct vmgpadl_packet_header {
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struct vmpacket_descriptor d;
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u32 gpadl;
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u32 reserved;
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} __packed;
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struct vmadd_remove_transfer_page_set {
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struct vmpacket_descriptor d;
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u32 gpadl;
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u16 xfer_pageset_id;
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u16 reserved;
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} __packed;
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/*
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* This structure defines a range in guest physical space that can be made to
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* look virtually contiguous.
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*/
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struct gpa_range {
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u32 byte_count;
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u32 byte_offset;
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u64 pfn_array[0];
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};
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/*
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* This is the format for an Establish Gpadl packet, which contains a handle by
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* which this GPADL will be known and a set of GPA ranges associated with it.
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* This can be converted to a MDL by the guest OS. If there are multiple GPA
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* ranges, then the resulting MDL will be "chained," representing multiple VA
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* ranges.
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*/
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struct vmestablish_gpadl {
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struct vmpacket_descriptor d;
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u32 gpadl;
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u32 range_cnt;
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struct gpa_range range[1];
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} __packed;
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/*
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* This is the format for a Teardown Gpadl packet, which indicates that the
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* GPADL handle in the Establish Gpadl packet will never be referenced again.
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*/
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struct vmteardown_gpadl {
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struct vmpacket_descriptor d;
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u32 gpadl;
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u32 reserved; /* for alignment to a 8-byte boundary */
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} __packed;
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/*
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* This is the format for a GPA-Direct packet, which contains a set of GPA
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* ranges, in addition to commands and/or data.
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*/
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struct vmdata_gpa_direct {
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struct vmpacket_descriptor d;
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u32 reserved;
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u32 range_cnt;
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struct gpa_range range[1];
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} __packed;
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/* This is the format for a Additional Data Packet. */
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struct vmadditional_data {
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struct vmpacket_descriptor d;
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u64 total_bytes;
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u32 offset;
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u32 byte_cnt;
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unsigned char data[1];
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} __packed;
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union vmpacket_largest_possible_header {
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struct vmpacket_descriptor simple_hdr;
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struct vmtransfer_page_packet_header xfer_page_hdr;
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struct vmgpadl_packet_header gpadl_hdr;
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struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr;
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struct vmestablish_gpadl establish_gpadl_hdr;
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struct vmteardown_gpadl teardown_gpadl_hdr;
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struct vmdata_gpa_direct data_gpa_direct_hdr;
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};
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#define VMPACKET_DATA_START_ADDRESS(__packet) \
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(void *)(((unsigned char *)__packet) + \
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((struct vmpacket_descriptor)__packet)->offset8 * 8)
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#define VMPACKET_DATA_LENGTH(__packet) \
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((((struct vmpacket_descriptor)__packet)->len8 - \
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((struct vmpacket_descriptor)__packet)->offset8) * 8)
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#define VMPACKET_TRANSFER_MODE(__packet) \
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(((struct IMPACT)__packet)->type)
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enum vmbus_packet_type {
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VM_PKT_INVALID = 0x0,
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VM_PKT_SYNCH = 0x1,
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VM_PKT_ADD_XFER_PAGESET = 0x2,
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VM_PKT_RM_XFER_PAGESET = 0x3,
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VM_PKT_ESTABLISH_GPADL = 0x4,
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VM_PKT_TEARDOWN_GPADL = 0x5,
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VM_PKT_DATA_INBAND = 0x6,
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VM_PKT_DATA_USING_XFER_PAGES = 0x7,
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VM_PKT_DATA_USING_GPADL = 0x8,
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VM_PKT_DATA_USING_GPA_DIRECT = 0x9,
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VM_PKT_CANCEL_REQUEST = 0xa,
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VM_PKT_COMP = 0xb,
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VM_PKT_DATA_USING_ADDITIONAL_PKT = 0xc,
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VM_PKT_ADDITIONAL_DATA = 0xd
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};
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#define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED 1
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#endif
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